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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0344cc766fecadeba82edb3f6fba6998f6ce00f67c74838b4ab0aaef2b9ac9dd' 
  AND token = '8md409tQvkBFvJ9jIiUgq9jdpn0sWw9sh3tUEfJKNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}